docs: def interpolate_data(self, data, limit, method):
          """ Interpolate dataframe.
  
          Parameters
          ----------
          data    : pd.DataFrame()
              Dataframe to interpolate
          limit   : int
              Interpolation limit.
          method  : str
              Interpolation method.
  
          Returns
          -------
          pd.DataFrame()
              Dataframe containing interpolated data
  
          """
          data = data.interpolate(how="index", limit=limit, method=method)        
          return data